Netzsch-mohnopumpen Gmbh

Netzsch Pumpen & Systeme Gmbh

Michael Robby

Johann Kreidl

Hisham Kamal

Franz Lachenwitzer

Uwe Neumann

Hansjuergen Linde

Mikael Tekneyan

Matthias Gradl

Reinhard Denk

Franz Kneidl

Robert Kurz

Helmuth Weber

Matthias Schaefer

Michael Groth

Guido Gutmann

Guenther Hantschk

Siegfried Jarzina

Thomas Ribbe

Karl-Heinz Rosner

Thomas Streubel

Alfred Thumser

Herbert Frisch

Helmut Bauer

Christoph Boehnisch

The invention relates to an eccentric screw pump and a method for its operation. Unlike the previously known prior art, where changes to the internal geometry of the pump stator caused by wear were always remedied with radially acting clamping measures, the invention is based on bringing this about by a change in the length of the lining.

Stator system

The aim of the invention is to improve the sealing possibilities between the elastic stator lining and corresponding connecting flanges of eccentric screw pumps. In order to increase the sealing surfaces, the stator lining comprises, at least at one of its ends, a conical sealing surface which may be provided with one or more prominent or recessed parts.

Eccentric screw pump having conical sealing surfaces

A stator for an eccentric spiral pump comprises a hollow body of an elastic material which has a casing comprising a plurality of segments extending in a longitudinal direction of the casing. Adjacent segments are interconnected along longitudinal sides at variable angles to each other, so that the segments enclose an entire circumference of the casing. Surfaces of the segments are of a planar configuration, so that a closed casing of polygonal cross-section is formed by the interconnected segments. The hollow body of elastic material is of a matching polygonal cross-section to achieve positive contact with the casing.

Stator for eccentric spiral pump

The present invention relates to the arrangement of a stator and a spare stator. In order to avoid a permanent correction in the length of the driving shaft, the spare stator is connected to the instantaneously operated stator or is configured in a single piece. Upon occurrence of a defined amount of wear, this stator combination is merely reversed through 180&#xb0; relative to the longitudinal axis or an intermediate tube is inserted so that the spare stator arrives in the rotor region.

Eccentric screw-type pump with spare stator

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Muehldorf, Germany

Michael Robby